Mitaka Series Release Notes

4.6.0

Upgrade Notes

• The default value of max_overflow config option has been increased from 10 to 50 in order to allow OpenStack services heavily using DBs to better handle spikes of concurrent requests and lower the probability of getting a pool timeout issue.

  This change potentially leads to increasing of the number of open connections to an RDBMS server. Depending on the configuration, you may see “too many connections” errors in logs of OpenStack services / RDBMS server. The max limit of connections can be set by the means of these config options:

  http://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_max_connections http://www.postgresql.org/docs/current/static/runtime-config-connection.html#GUC-MAX-CONNECTIONS

  For details, please see the following LP:

  https://bugs.launchpad.net/oslo.db/+bug/1535375

  and the ML thread:

  http://lists.openstack.org/pipermail/openstack-dev/2015-December/082717.html

Other Notes

• Introduce reno for deployer release notes.